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Table 5 The proportion of students who reported having ever used cannabis, meth/amphetamine or ecstasy in their lifetime for the intervention and control groups over time (95% confidence intervals and sample size)

From: A universal harm-minimisation approach to preventing psychostimulant and cannabis use in adolescents: a cluster randomised controlled trial

  

Baseline

Post-intervention

Five month follow-up

10 month follow-up

Proportion ever used cannabis

Control

0.15

0.16

0.16

0.20

(0.13-0.17)

(0.13-0.19)

(0.13-0.19)

(0.16-0.24)

(n = 828)

(n = 580)

(n = 450)

(n = 403)

Intervention

0.09

0.11

0.13

0.12

(0.07-0.11)

(0.09-0.13)

(0.10-0.16)

(0.09-0.15)

(n = 903)

(n = 627)

(n = 614)

(n = 570)

Proportion ever used meth/amphetamine

Control

0.05

0.06

0.07

0.05

(0.04-0.06)

(0.04-0.08)

(0.05-0.09)

(0.03-0.07)

(n = 827)

(n = 577)

(n =449)

(n = 403)

Intervention

0.04

0.03

0.05

0.04

(0.03-0.05)

(0.02-0.04)

(0.03-0.07)

(0.02-0.06)

(n = 906)

(n = 627

(n = 613)

(n = 570)

Proportion ever used ecstasy

Control

0.07

0.09

0.09

0.07

(0.05-0.09)

(0.07-0.11)

(0.07-0.12)

(0.05-0.09)

(n = 827)

(n = 580)

(n = 449)

(n = 403)

Intervention

0.05

0.05

0.06

0.06

(0.04-0.07)

(0.03-0.06)

(0.04-0.08)

(0.04-0.08)

(n = 904)

(n = 627)

(n = 614)

(n = 569)